Brake



Nov. 28, 1933. R. F. KoHR BRAKE Filed April 27, 1931 Y /I/I ATTORNEY Patented Nov. 28, `V1933 UNiT-ED srTes l y 1,937,200rv BRAKEVy.-

j '-Robert F. Kohr, South'Bend, Ind., assigner to.` Bendix Brake Company, South Bend, Ind., ai

. corporation of V-Illinois Application April 27, 1931.4 Serial No. 533,241

s claims. (Cl. 18s-279.5)

This invention relates te mtenelexpanding l brakes. f'

Broadly.. the invention comprehends an internal expanding brake having an adjusting device for thefrictionelements arranged to increase the overalllength of these elements to compensate for wear on the linings ofthe brake.

In the illustrated embodiment of the invention a friction element is shown 'including interretained lin position by a spring connected between the shoes. y

An object of the invention is to provide an expansible device having but few parts ywhich may be stamped from sheet steel in large quantities and produced at an exceedingly low cost. Another object of the invention is toV provide an expansible device for the friction elements of a brake which is exceedingly cheap and simple and may be easily and quickly assembled. Yet anotherobject of the invention is to provide an expansible device for the friction elements of a brake which may be easily and quickly applied and will effectively perform its intended function.

Other objects of the invention will appear from the following description taken in connection with the drawing, which forms a part of this specification, and inwhich:

- Figure 1 is a vertical section of the brake taken just back of the head of the drum illustrating the friction elements in side elevation and showing .35 the invention as applied;

`Figure 2 isa sectional view substantially on line 2 2 of Figure 1; and

Figure 3 is a sectional view substantially on line 3 3 of Figure 1.

Referring tothe drawing for more specific details of the invention,- represents a xed support such as a backing plate. The backing plate has associated therewith a rotatable drum 12 which may be secured to a wheelpnot shown. Positioned on the backing plate is a fixed anchor 14. As shown, a reinforcing plate 16v is spot welded or otherwise securedto the backing plate and the anchor is positioned on the reinforcing plate. The anchor has a shoulder which is seated on the reinforcing plate and a portion which extends through the reinforcing plate and backingV plate and riveted against the backing plate.v The anchor is further provided with parallel flat anchoring surfaces 18 and 20, the object of which V will hereinafter appear.

vand 28.

j-18 and 20on the anchor.

'Positioned on suitable steady rests 22 `and 24 are interchangeable friction elements or shoes'26 Each of these shoes Vincludes a web 30 supporting a rim 32 to Vwhich isY suitably'secured a lining 34 adaptable for cooperation with the @0 braking surface of the drum.

Positioned on the anchor 14 is a floating operating lever 36 having spaced cams 38 and 40. The friction elements 26 and 28 have their shoulders or separable endsnotched as indicated at B5 42 and 44 for the reception of theflat surfaces YThe vfrictionv elements are held in vengagement with the anchor and the floating Voperating cam 36 by a suitableV return spring 46 connected be- 70 tween the separable ends of the friction element and by an auxiliary return spring 48 connected between the anchor and the friction element 28. The floating koperating cam is connected to a suitable tension member 50 extending through *75 thebacking plate to a source of power, not shown.

The articulated ends of the friction element are connected by an expansible device 52 retained in position between the friction elements by a suit-v able spring 54 connected between the articulated 80 ends of the friction elements. As shown, the articulated ends of the friction elements are provided With corresponding notches 56 and 58 adaptable Afor the reception of the expansiblel device. f y 35 The expansible device includes two stampings 60 and 62 provided with registering slots.64 and 66. 'A small plate 68 is interposed between the stampings 60 and 62 and the stampings are suitably secured to the plate. As shown, the '90 plate has a rounded end portion '10 adapted to fit snugly in the notch 56 or 58, as the case may be. The plate 68 serves to retain the stampings in spaced relation, so that the articulated ends of the friction elements or shoes 26 and 28 may 95 slide freely between the stampings, vand the stamping 62 has a lateral portion bent to provide a bracket 72.

As shown, a wedge-shaped member '74 is poy Y lsitioned in the slots 64 and V66 and threaded intoV 100 V for the reception of an adjusting wrench, and '105 the head 80 extends through a suitable opening in the backing plate, so that the screw maybe readily accessible.

In operation, the adjusting memberis fitted between the friction elements or shoes 26 and 28, '110 vice and prevents, in cooperation with the notches on the shoes, displacement of the device. rBy

turning the screw 76 the wedge 74 is moved trans.- versely in the registering slots 64 and 66, and since` the shoe 28 engages the wedge '74 lmovement, of

the wedge in either direction eiects an adjustment of the shoe.

Although this invention yhas been described inconnection with certain specific embodiments, the principles involved are susceptible of numerous other applications v`that will `readily occur topersons skilled in the art. The invention is,there fore, to be limited only as indicated by thescope of the appended claims.

The above-described applying and means is claimed in myy divisional application No. 693,240, led October 12,1933.

Having thus described the various features of.

the invention, what I claim as new and desireto secure byLetters Patent is: d i

1. A brake comprising a shoe formed with a socket in its end and having anadjusting device including corresponding stampingsV embracing the 35 wie' K anchoring l end of the shoe between them and having registering longitudinal slots, a spacer between the stampings having a curved end pivotally seated in said' socket, a bracket formed on one of the members, a member movable transversely in the slots and a screw on the bracket threaded into the member.

, 2; A brake comprising friction elements having notches in their articulated ends, an adjusting device connected between the articulated ends of the v friction elements including corresponding stampings having registering longitudinal slots, a spacer between the stampings having a curved end engaging thenotch in one of the friction elements, a member movable transversely in the "slots engaging .the notch in the other friction element, a bracket on one of the stampings and a screw on`the-bra`cket threaded into the member.

3.Abrake comprising a fixed support, a rotatableY drum associated therewith, friction elements on the support adaptable for cooperation with the drum, operating means for the friction elements; an adjusting means for :the ifriction elements including'corresponding stampings havving registering longitudinal; slots, aV yspacer bel'- tweenthe stampings abutting the web on one of the friction elements, a-wedge-shapedr member movable transversely in the slots abutting the i. web on theother'friction element, a bracket on voneof thestampings and a screw supportedby the bracket and threaded into the wedge-shaped member. K

ROBERT F. KOHR. 

